先看效果图。。。

1.jpg

2.jpg

public class ShoppingCartActivity extends AppCompatActivity implements View.OnClickListener {

    private ImageView imgCart;

    private RecyclerView rvType, rvSelected;
    private TextView tvCount, tvCost, tvSubmit, tvTips;
    private BottomSheetLayout bottomSheetLayout;
    private View bottomSheet;
    private StickyListHeadersListView listView;


    private ArrayList<GoodsItem> dataList, typeList;
    private SparseArray<GoodsItem> selectedList;//购物车数据
    private SparseIntArray groupSelect;//购物车数据数量

    private GoodsAdapter myAdapter;//右  数据适配器
    private SelectAdapter selectAdapter;//购物车弹出框  适配器
    private TypeAdapter typeAdapter;//种类适配器

    private NumberFormat nf;
    private Handler mHanlder;
    private ViewGroup anim_mask_layout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_shopping_cart);
        nf = NumberFormat.getCurrencyInstance();
        nf.setMaximumFractionDigits(2);
        mHanlder = new Handler(getMainLooper());
        dataList = GoodsItem.getGoodsList();//右数据
        typeList = GoodsItem.getTypeList();//左类数据
        selectedList = new SparseArray<>();//购物车数据
        groupSelect = new SparseIntArray();//左数量
        initView();
    }

    private void initView() {
        tvCount = (TextView) findViewById(R.id.tvCount);
        tvCost = (TextView) findViewById(R.id.tvCost);
        tvTips = (TextView) findViewById(R.id.tvTips);
        tvSubmit = (TextView) findViewById(R.id.tvSubmit);
        rvType = (RecyclerView) findViewById(R.id.typeRecyclerView);

        imgCart = (ImageView) findViewById(R.id.imgCart);
        anim_mask_layout = (RelativeLayout) findViewById(R.id.containerLayout);
        bottomSheetLayout = (BottomSheetLayout) findViewById(R.id.bottomSheetLayout);

        listView = (StickyListHeadersListView) findViewById(R.id.itemListView);

        rvType.setLayoutManager(new LinearLayoutManager(this));
        typeAdapter = new TypeAdapter(this, typeList);
        rvType.setAdapter(typeAdapter);
        rvType.addItemDecoration(new DividerDecoration(this));

        myAdapter = new GoodsAdapter(dataList, this);
        listView.setAdapter((StickyListHeadersAdapter) myAdapter);

        listView.setOnScrollListener(new AbsListView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {

            }

            @Override
            public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
                GoodsItem item = dataList.get(firstVisibleItem);
                if (typeAdapter.selectTypeId != item.typeId) {
                    typeAdapter.selectTypeId = item.typeId;
                    typeAdapter.notifyDataSetChanged();
                    rvType.smoothScrollToPosition(getSelectedGroupPosition(item.typeId));
                }
            }
        });

    }


    public void playAnimation(int[] start_location) {
        ImageView img = new ImageView(this);
        img.setImageResource(R.drawable.circle_red);
        setAnim(img, start_location);
    }

    private Animation createAnim(int startX, int startY) {
        int[] des = new int[2];
        imgCart.getLocationInWindow(des);

        AnimationSet set = new AnimationSet(false);

        Animation translationX = new TranslateAnimation(0, des[0] - startX, 0, 0);
        translationX.setInterpolator(new LinearInterpolator());
        Animation translationY = new TranslateAnimation(0, 0, 0, des[1] - startY);
        translationY.setInterpolator(new AccelerateInterpolator());
        Animation alpha = new AlphaAnimation(1, 0.5f);
        set.addAnimation(translationX);
        set.addAnimation(translationY);
        set.addAnimation(alpha);
        set.setDuration(500);

        return set;
    }

    private void addViewToAnimLayout(final ViewGroup vg, final View view,
                                     int[] location) {

        int x = location[0];
        int y = location[1];
        int[] loc = new int[2];
        vg.getLocationInWindow(loc);
        view.setX(x);
        view.setY(y - loc[1]);
        vg.addView(view);
    }

    private void setAnim(final View v, int[] start_location) {

        addViewToAnimLayout(anim_mask_layout, v, start_location);
        Animation set = createAnim(start_location[0], start_location[1]);
        set.setAnimationListener(new Animation.AnimationListener() {
            @Override
            public void onAnimationStart(Animation animation) {

            }

            @Override
            public void onAnimationEnd(final Animation animation) {
                mHanlder.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        anim_mask_layout.removeView(v);
                    }
                }, 100);
            }

            @Override
            public void onAnimationRepeat(Animation animation) {

            }
        });
        v.startAnimation(set);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.bottom:
                showBottomSheet();
                break;
            case R.id.clear:
                clearCart();
                break;
            case R.id.tvSubmit:
                Toast.makeText(ShoppingCartActivity.this, "结算", Toast.LENGTH_SHORT).show();
                break;
            default:
                break;
        }
    }

    //添加商品
    public void add(GoodsItem item, boolean refreshGoodList) {

        int groupCount = groupSelect.get(item.typeId);
        if (groupCount == 0) {
            groupSelect.append(item.typeId, 1);
        } else {
            groupSelect.append(item.typeId, ++groupCount);
        }

        GoodsItem temp = selectedList.get(item.id);
        if (temp == null) {
            item.count = 1;
            selectedList.append(item.id, item);
        } else {
            temp.count++;
        }
        update(refreshGoodList);
    }

    //移除商品
    public void remove(GoodsItem item, boolean refreshGoodList) {

        int groupCount = groupSelect.get(item.typeId);
        if (groupCount == 1) {
            groupSelect.delete(item.typeId);
        } else if (groupCount > 1) {
            groupSelect.append(item.typeId, --groupCount);
        }

        GoodsItem temp = selectedList.get(item.id);
        if (temp != null) {
            if (temp.count < 2) {
                selectedList.remove(item.id);
            } else {
                item.count--;
            }
        }
        update(refreshGoodList);
    }

    //刷新布局 总价、购买数量等
    private void update(boolean refreshGoodList) {
        int size = selectedList.size();
        int count = 0;
        double cost = 0;
        for (int i = 0; i < size; i++) {
            GoodsItem item = selectedList.valueAt(i);
            count += item.count;
            cost += item.count * item.price;
        }

        if (count < 1) {
            tvCount.setVisibility(View.GONE);
        } else {
            tvCount.setVisibility(View.VISIBLE);
        }

        tvCount.setText(String.valueOf(count));

        if (cost > 99.99) {
            tvTips.setVisibility(View.GONE);
            tvSubmit.setVisibility(View.VISIBLE);
        } else {
            tvSubmit.setVisibility(View.GONE);
            tvTips.setVisibility(View.VISIBLE);
        }

        tvCost.setText(nf.format(cost));

        if (myAdapter != null && refreshGoodList) {
            myAdapter.notifyDataSetChanged();
        }
        if (selectAdapter != null) {
            selectAdapter.notifyDataSetChanged();
        }
        if (typeAdapter != null) {
            typeAdapter.notifyDataSetChanged();
        }
        if (bottomSheetLayout.isSheetShowing() && selectedList.size() < 1) {
            bottomSheetLayout.dismissSheet();
        }
    }

    //清空购物车
    public void clearCart() {
        selectedList.clear();
        groupSelect.clear();
        update(true);

    }

    //根据商品id获取当前商品的采购数量
    public int getSelectedItemCountById(int id) {
        GoodsItem temp = selectedList.get(id);
        if (temp == null) {
            return 0;
        }
        return temp.count;
    }

    //根据类别Id获取属于当前类别的数量
    public int getSelectedGroupCountByTypeId(int typeId) {
        return groupSelect.get(typeId);
    }


    //根据类别id获取分类的Position 用于滚动左侧的类别列表
    public int getSelectedGroupPosition(int typeId) {
        for (int i = 0; i < typeList.size(); i++) {
            if (typeId == typeList.get(i).typeId) {
                return i;
            }
        }
        return 0;
    }

    public void onTypeClicked(int typeId) {
        listView.setSelection(getSelectedPosition(typeId));
    }

    private int getSelectedPosition(int typeId) {
        int position = 0;
        for (int i = 0; i < dataList.size(); i++) {
            if (dataList.get(i).typeId == typeId) {
                position = i;
                break;
            }
        }
        return position;
    }

    private View createBottomSheetView() {
        Log.e("sss","444");
        View view = LayoutInflater.from(this).inflate(R.layout.layout_bottom_sheet, (ViewGroup) getWindow().getDecorView(), false);
        rvSelected = (RecyclerView) view.findViewById(R.id.selectRecyclerView);
        rvSelected.setLayoutManager(new LinearLayoutManager(this));
        TextView clear = (TextView) view.findViewById(R.id.clear);
        clear.setOnClickListener(this);
        selectAdapter = new SelectAdapter(this, selectedList);
        rvSelected.setAdapter(selectAdapter);


        return view;
    }

    private void showBottomSheet() {
        if (bottomSheet == null) {
            bottomSheet = createBottomSheetView();
            Log.e("sss","111");
        }
        if (bottomSheetLayout.isSheetShowing()) {
            bottomSheetLayout.dismissSheet();
            Log.e("sss","222");
        } else {
            if (selectedList.size() != 0) {
                bottomSheetLayout.showWithSheetView(bottomSheet);
                Log.e("sss","333");
            }
        }
    }
}

左边列表adapter（左右关联）

public class TypeAdapter extends RecyclerView.Adapter<TypeAdapter.ViewHolder> {
    public int selectTypeId;
    public ShoppingCartActivity activity;
    public ArrayList<GoodsItem> dataList;

    public TypeAdapter(ShoppingCartActivity activity, ArrayList<GoodsItem> dataList) {
        this.activity = activity;
        this.dataList = dataList;
    }


    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_type,parent,false);
        ViewHolder holder = new ViewHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        GoodsItem item = dataList.get(position);

        holder.bindData(item);
    }

    @Override
    public int getItemCount() {
        if(dataList==null){
            return 0;
        }
        return dataList.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{

        TextView tvCount,type;
        private GoodsItem item;
        public ViewHolder(View itemView) {
            super(itemView);
            tvCount = (TextView) itemView.findViewById(R.id.tvCount);
            type = (TextView) itemView.findViewById(R.id.type);
            itemView.setOnClickListener(this);
        }

        @SuppressLint("ResourceAsColor")
        public void
        bindData(GoodsItem item){
            this.item = item;
            type.setText(item.typeName);
            Log.e("pppp","adapter   "+activity.getSelectedGroupCountByTypeId(item.typeId)+"");

            int count = activity.getSelectedGroupCountByTypeId(item.typeId);
            tvCount.setText(String.valueOf(count));
            if(count<1){
                tvCount.setVisibility(View.GONE);
            }else{
                tvCount.setVisibility(View.VISIBLE);
            }
            if(item.typeId==selectTypeId){
                itemView.setBackgroundColor(Color.RED);
            }else{
                itemView.setBackgroundColor(Color.WHITE);
            }

        }

        @Override
        public void onClick(View v) {
            activity.onTypeClicked(item.typeId);
        }
    }
}

右边列表adapter

public class GoodsAdapter extends BaseAdapter implements StickyListHeadersAdapter {

    private ArrayList<GoodsItem> dataList;
    private ShoppingCartActivity mContext;
    private NumberFormat nf;
    private LayoutInflater mInflater;

    public GoodsAdapter(ArrayList<GoodsItem> dataList, ShoppingCartActivity mContext) {
        this.dataList = dataList;
        this.mContext = mContext;
        nf = NumberFormat.getCurrencyInstance();
        nf.setMaximumFractionDigits(2);
        mInflater = LayoutInflater.from(mContext);
    }

    @Override
    public View getHeaderView(int position, View convertView, ViewGroup parent) {
        if(convertView==null) {
            convertView = mInflater.inflate(R.layout.item_header_view, parent, false);
        }
        ((TextView)(convertView)).setText(dataList.get(position).typeName);
        return convertView;
    }

    @Override
    public long getHeaderId(int position) {
        return dataList.get(position).typeId;
    }

    @Override
    public int getCount() {
        if(dataList==null){
            return 0;
        }
        return dataList.size();
    }

    @Override
    public Object getItem(int position) {
        return dataList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ItemViewHolder holder = null;
        if(convertView==null){
            convertView = mInflater.inflate(R.layout.item_goods,parent,false);
            holder = new ItemViewHolder(convertView);
            convertView.setTag(holder);
        }else{
            holder = (ItemViewHolder) convertView.getTag();
        }
        GoodsItem item = dataList.get(position);
        holder.bindData(item);
        return convertView;
    }

    class ItemViewHolder implements View.OnClickListener{
        private TextView name,price,tvAdd,tvMinus,tvCount;
        private GoodsItem item;
        private RatingBar ratingBar;

        public ItemViewHolder(View itemView) {
            name = (TextView) itemView.findViewById(R.id.tvName);
            price = (TextView) itemView.findViewById(R.id.tvPrice);
            tvCount = (TextView) itemView.findViewById(R.id.count);
            tvMinus = (TextView) itemView.findViewById(R.id.tvMinus);
            tvAdd = (TextView) itemView.findViewById(R.id.tvAdd);
            ratingBar = (RatingBar) itemView.findViewById(R.id.ratingBar);
            tvMinus.setOnClickListener(this);
            tvAdd.setOnClickListener(this);
        }

        public void bindData(GoodsItem item){

            Log.e("TAG", "bindData: " );
            this.item = item;
            name.setText(item.name);
            ratingBar.setRating(item.rating);
            item.count = mContext.getSelectedItemCountById(item.id);//根据商品id获取当前商品的采购数量
            tvCount.setText(String.valueOf(item.count));
            price.setText(nf.format(item.price));
            if(item.count<1){
                tvCount.setVisibility(View.GONE);
                tvMinus.setVisibility(View.GONE);
            }else{
                tvCount.setVisibility(View.VISIBLE);
                tvMinus.setVisibility(View.VISIBLE);
            }
        }

        @Override
        public void onClick(View v) {
            ShoppingCartActivity activity = mContext;
            switch (v.getId()){
                case R.id.tvAdd: {
                    int count = activity.getSelectedItemCountById(item.id);
                    if (count < 1) {
                        tvMinus.setAnimation(getShowAnimation());
                        tvMinus.setVisibility(View.VISIBLE);
                        tvCount.setVisibility(View.VISIBLE);
                    }
                    activity.add(item, false);
                    count++;
                    tvCount.setText(String.valueOf(count));
                    int[] loc = new int[2];
                    v.getLocationInWindow(loc);
                    activity.playAnimation(loc);
                }
                break;
                case R.id.tvMinus: {
                    int count = activity.getSelectedItemCountById(item.id);
                    if (count < 2) {
                        tvMinus.setAnimation(getHiddenAnimation());
                        tvMinus.setVisibility(View.GONE);
                        tvCount.setVisibility(View.GONE);
                    }
                    count--;
                    activity.remove(item, false);//activity.getSelectedItemCountById(item.id)
                    tvCount.setText(String.valueOf(count));

                }
                break;
                default:
                    break;
            }
        }
    }

    private Animation getShowAnimation(){
        AnimationSet set = new AnimationSet(true);
        RotateAnimation rotate = new RotateAnimation(0,720,RotateAnimation.RELATIVE_TO_SELF,0.5f,RotateAnimation.RELATIVE_TO_SELF,0.5f);
        set.addAnimation(rotate);
        TranslateAnimation translate = new TranslateAnimation(
                TranslateAnimation.RELATIVE_TO_SELF,2f
                ,TranslateAnimation.RELATIVE_TO_SELF,0
                ,TranslateAnimation.RELATIVE_TO_SELF,0
                ,TranslateAnimation.RELATIVE_TO_SELF,0);
        set.addAnimation(translate);
        AlphaAnimation alpha = new AlphaAnimation(0,1);
        set.addAnimation(alpha);
        set.setDuration(500);
        return set;
    }

    private Animation getHiddenAnimation(){
        AnimationSet set = new AnimationSet(true);
        RotateAnimation rotate = new RotateAnimation(0,720,RotateAnimation.RELATIVE_TO_SELF,0.5f,RotateAnimation.RELATIVE_TO_SELF,0.5f);
        set.addAnimation(rotate);
        TranslateAnimation translate = new TranslateAnimation(
                TranslateAnimation.RELATIVE_TO_SELF,0
                ,TranslateAnimation.RELATIVE_TO_SELF,2f
                ,TranslateAnimation.RELATIVE_TO_SELF,0
                ,TranslateAnimation.RELATIVE_TO_SELF,0);
        set.addAnimation(translate);
        AlphaAnimation alpha = new AlphaAnimation(1,0);
        set.addAnimation(alpha);
        set.setDuration(500);
        return set;
    }
}

购物车adapter

public class SelectAdapter extends RecyclerView.Adapter<SelectAdapter.ViewHolder>{
    private ShoppingCartActivity activity;
    private SparseArray<GoodsItem> dataList;
    private NumberFormat nf;
    private LayoutInflater mInflater;
    public SelectAdapter(ShoppingCartActivity activity, SparseArray<GoodsItem> dataList) {
        this.activity = activity;
        this.dataList = dataList;
        nf = NumberFormat.getCurrencyInstance();
        nf.setMaximumFractionDigits(2);
        mInflater = LayoutInflater.from(activity);
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = mInflater.inflate(R.layout.item_selected_goods,parent,false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        GoodsItem item = dataList.valueAt(position);
        holder.bindData(item);
    }

    @Override
    public int getItemCount() {
        if(dataList==null) {
            return 0;
        }
        return dataList.size();
    }

    class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
        private GoodsItem item;
        private TextView tvCost,tvCount,tvAdd,tvMinus,tvName;

        public ViewHolder(View itemView) {
            super(itemView);
            tvName = (TextView) itemView.findViewById(R.id.tvName);
            tvCost = (TextView) itemView.findViewById(R.id.tvCost);
            tvCount = (TextView) itemView.findViewById(R.id.count);
            tvMinus = (TextView) itemView.findViewById(R.id.tvMinus);
            tvAdd = (TextView) itemView.findViewById(R.id.tvAdd);
            tvMinus.setOnClickListener(this);
            tvAdd.setOnClickListener(this);
        }

        @Override
        public void onClick(View v) {
            switch (v.getId()){
                case R.id.tvAdd:
                    activity.add(item, true);
                    break;
                case R.id.tvMinus:
                    activity.remove(item, true);
                    break;
                default:
                    break;
            }
        }

        public void bindData(GoodsItem item){
            this.item = item;
            tvName.setText(item.name);
            tvCost.setText(nf.format(item.count*item.price));
            tvCount.setText(String.valueOf(item.count));
        }
    }
}

数据源 （自己随便加的 ）

public class GoodsItem {
    public int id;
    public int typeId;
    public int rating;
    public String name;
    public String typeName;
    public double price;
    public int count;//


    public GoodsItem(int id, double price, String name, int typeId, String typeName) {
        this.id = id;
        this.price = price;
        this.name = name;
        this.typeId = typeId;
        this.typeName = typeName;
        rating = new Random().nextInt(5) + 1;
    }

    private static ArrayList<GoodsItem> goodsList;
    private static ArrayList<GoodsItem> typeList;

    private static void initData() {
        goodsList = new ArrayList<>();
        typeList = new ArrayList<>();
        GoodsItem item = null;


        for(int i=1;i<4;i++){           //外层
            for(int j=1;j<15;j++){           //里面层

                Log.e("sss",100*i+j+"");
                item = new GoodsItem(100*i+j,Math.random()*100,"商品"+(100*i+j),i,"种类种类"+i);
                goodsList.add(item);
            }
            typeList.add(item);
        }


    }

    public static ArrayList<GoodsItem> getGoodsList() {
        if (goodsList == null) {
            initData();
        }
        return goodsList;
    }

    public static ArrayList<GoodsItem> getTypeList() {
        if (typeList == null) {
            initData();
        }
        return typeList;
    }
}

最后DividerDecoration类 分割线 可以在自己百度。。。

布局文件（activity_shopping_cart）

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/containerLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#f2f2f2"
    tools:context="com.example.shoppingcart.ShoppingCartActivity">

    <include
        layout="@layout/layout_mian_shopping_cart"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/bottom" />

    <LinearLayout
        android:id="@+id/bottom"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:background="#aa000000"
        android:clickable="true"
        android:gravity="center_vertical"
        android:onClick="onClick"
        android:orientation="horizontal">

        <RelativeLayout
            android:layout_width="60dp"
            android:layout_height="match_parent">

            <ImageView
                android:id="@+id/imgCart"
                android:layout_width="32dp"
                android:layout_height="32dp"
                android:layout_centerInParent="true"
                android:src="@drawable/icon_cart" />

            <TextView
                android:id="@+id/tvCount"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:layout_marginTop="5dp"
                android:layout_marginRight="5dp"
                android:background="@drawable/circle_red"
                android:gravity="center"
                android:text="1"
                android:textColor="#fff"
                android:textSize="12sp"
                android:visibility="gone" />
        </RelativeLayout>

        <TextView
            android:id="@+id/tvCost"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_weight="1"
            android:gravity="center_vertical"
            android:text="￥ 0"
            android:textColor="#fff"
            android:textSize="20sp" />

        <TextView
            android:id="@+id/tvTips"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_marginRight="10dp"
            android:gravity="center"
            android:text="￥100元起送"
            android:textColor="#fff" />

        <TextView
            android:id="@+id/tvSubmit"
            android:layout_width="120dp"
            android:layout_height="match_parent"
            android:background="#22c222"
            android:clickable="true"
            android:gravity="center"
            android:onClick="onClick"
            android:text="去结算"
            android:textColor="#fff"
            android:textSize="18sp"
            android:visibility="gone" />
    </LinearLayout>
</RelativeLayout>

布局文件（item_goods.xml）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    >
    


    <ImageView
        android:id="@+id/img"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_margin="5dp"
        android:src="@mipmap/ic_launcher" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:paddingTop="5dp"
        android:paddingRight="5dp">

        <TextView
            android:id="@+id/tvName"
            android:layout_width="300dp"
            android:layout_height="wrap_content"
            android:text="已加入肯德基豪华套餐"
            android:textColor="#000"
            android:textSize="16sp" />

        <RatingBar
            android:id="@+id/ratingBar"
            style="@style/Base.Widget.AppCompat.RatingBar.Small"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:isIndicator="true"
            android:numStars="5"
            android:rating="3.5"
            android:stepSize="0.5" />

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <TextView
                android:id="@+id/tvPrice"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="￥ 100"
                android:textColor="#FF3300"
                android:textSize="16sp" />

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:layout_toRightOf="@id/tvPrice"
                android:gravity="right">

                <TextView
                    android:id="@+id/tvMinus"
                    android:layout_width="20dp"
                    android:layout_height="20dp"
                    android:background="@drawable/button_minus"
                    android:clickable="true"
                    android:gravity="center"
                    android:textStyle="bold"
                    android:visibility="gone" />

                <TextView
                    android:id="@+id/count"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center_vertical"
                    android:gravity="center"
                    android:minWidth="20dp"
                    android:text="0"
                    android:textSize="16sp"
                    android:visibility="gone" />

                <TextView
                    android:id="@+id/tvAdd"
                    android:layout_width="20dp"
                    android:layout_height="20dp"
                    android:background="@drawable/button_add"
                    android:clickable="true"
                    android:gravity="center"
                    android:textStyle="bold" />
            </LinearLayout>
        </RelativeLayout>
    </LinearLayout>
</LinearLayout>

布局文件（item_header_view.xml）

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center_vertical"
    android:textSize="16sp"
    android:padding="5dp"
    android:background="#ddc1c1c1"
    android:textColor="#0066FF"
    android:text="标题">

</TextView>

布局文件（item_selected_goods.xml）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="1dp"
    android:background="#fff"
    android:gravity="center_vertical"
    android:orientation="horizontal"
    android:padding="10dp">

    <TextView
        android:id="@+id/tvName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="商品名"
        android:textSize="16sp" />

    <TextView
        android:id="@+id/tvCost"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:text="￥ 100"
        android:textColor="@android:color/holo_orange_dark"
        android:textSize="16sp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_toRightOf="@id/tvPrice"
        android:gravity="right">

        <TextView
            android:id="@+id/tvMinus"
            android:layout_width="20dp"
            android:layout_height="20dp"
            android:background="@drawable/button_minus"
            android:clickable="true"
            android:gravity="center"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/count"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:gravity="center"
            android:minWidth="20dp"
            android:text="0"
            android:textSize="16sp" />

        <TextView
            android:id="@+id/tvAdd"
            android:layout_width="20dp"
            android:layout_height="20dp"
            android:background="@drawable/button_add"
            android:clickable="true"
            android:gravity="center"
            android:textStyle="bold" />
    </LinearLayout>
</LinearLayout>

布局文件（item_type.xml）

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:clickable="true">

    <TextView
        android:id="@+id/type"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:padding="5dp"
        android:text="种类1"></TextView>

    <TextView
        android:id="@+id/tvCount"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_marginTop="5dp"
        android:layout_marginRight="10dp"
        android:background="@drawable/circle_red"
        android:gravity="center"
        android:text="1"
        android:textColor="#fff"
        android:textSize="12sp" />
</RelativeLayout>

布局文件（layout_bottom_sheet.xml）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#fff"
    android:orientation="vertical">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:background="#fff"
        android:paddingLeft="10dp"
        android:paddingRight="10dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:text="购物车"
            android:textColor="#000"
            android:textSize="18sp" />

        <TextView
            android:id="@+id/clear"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:clickable="true"
            android:text="清空"
            android:textSize="18sp" />
    </RelativeLayout>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/selectRecyclerView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"></androidx.recyclerview.widget.RecyclerView>



</LinearLayout>

布局文件（layout_mian_shopping_cart.xml）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#fff"
    android:orientation="vertical">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:background="#fff"
        android:paddingLeft="10dp"
        android:paddingRight="10dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:text="购物车"
            android:textColor="#000"
            android:textSize="18sp" />

        <TextView
            android:id="@+id/clear"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:clickable="true"
            android:text="清空"
            android:textSize="18sp" />
    </RelativeLayout>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/selectRecyclerView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"></androidx.recyclerview.widget.RecyclerView>



</LinearLayout>

最后附上下载地址：https://gitee.com/oubajunping/shopping-cart.git